要去除PDF密碼保護(hù)需使用Adobe Acrobat Pro并擁有文檔所有者密碼。步驟包括：1. 打開Adobe Acrobat Pro，選擇受密碼保護(hù)的PDF文件；2. 輸入正確的所有者密碼；3. 進(jìn)入“工具”>“保護(hù)”>“加密”>“移除安全”；4. 在彈出窗口點(diǎn)擊“確定”確認(rèn)移除。若無Acrobat Pro，可請求他人協(xié)助或使用第三方解密工具，但需注意隱私風(fēng)險。常見問題包括密碼無效、安全設(shè)置灰顯以及移除后仍提示密碼，解決方法為檢查密碼輸入、嘗試轉(zhuǎn)換文件格式或更新軟件版本。若無法解決，可聯(lián)系A(chǔ)dobe支持或更換Acrobat版本處理。始終確保在合法授權(quán)下操作。

Removing password protection from a PDF in Adobe Acrobat isn’t too hard if you have the right tools and permissions. The key thing to know is that you’ll need the document’s owner password — without it, you can’t make changes like removing security. If you’re the one who set the password or have access to it, here’s how to go about unlocking the file.

How to remove a password using Adobe Acrobat Pro

Adobe Acrobat Pro (not the free Reader) allows you to remove password protection if you have the correct password. Here's what to do:

• Open Adobe Acrobat Pro
• Go to File > Open and select your password-protected PDF
• Enter the password when prompted
• Once open, go to Tools > Protect > Encrypt > Remove Security
• In the dialog box that appears, click OK to confirm removal

If the document was encrypted with an owner password (the one that restricts editing), this process will remove the restrictions. If there’s a user password (the one required just to open the file), you'll be asked to enter it again during this step.

What if I don’t have Adobe Acrobat Pro?

Unfortunately, Adobe Reader doesn't let you remove passwords — it only lets you view protected files if you have the password. So if you don’t have Pro, you have a couple of options:

• Ask someone with Acrobat Pro to help remove the password for you
• Use online tools or third-party software that supports PDF decryption
  Just be careful: uploading sensitive documents to unknown websites can be risky

Some popular tools include PDF Unlocker or Smallpdf, but always read reviews and understand the privacy implications before uploading anything.

Common issues when removing PDF passwords

Sometimes even with the right software and password, things don’t go smoothly. Here are a few common problems:

• Password not working: Double-check for typos or case sensitivity. Some passwords are easy to misread (like capital “O” vs number “0”).
• Security settings grayed out: This usually means the file is encrypted in a way that Acrobat can’t modify directly — try printing to PDF or converting through another format first.
• Document still asks for a password after removal: Make sure you saved the file after removing the encryption. Also, some versions of Acrobat may behave differently depending on how the original encryption was applied.

If none of these steps work, consider contacting Adobe support or trying a different version of Acrobat.

基本上就這些。只要掌握密碼并使用正確的 Adobe Acrobat 版本，解除 PDF 密碼保護(hù)其實(shí)不難。但記得，如果 the file isn’t yours, you should always get permission before trying to remove any kind of security.

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